DbDeleteCommandTree.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / CommandTrees / DbDeleteCommandTree.cs / 1305376 / DbDeleteCommandTree.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;

using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees.Internal; 
using System.Data.Common.Utils;
 
namespace System.Data.Common.CommandTrees 
{
    ///  
    /// Represents a single row delete operation expressed as a canonical command tree.
    /// 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
    public sealed class DbDeleteCommandTree : DbModificationCommandTree 
    {
        private readonly DbExpression _predicate; 
 
        internal DbDeleteCommandTree(MetadataWorkspace metadata, DataSpace dataSpace, DbExpressionBinding target, DbExpression predicate)
            : base(metadata, dataSpace, target) 
        {
            EntityUtil.CheckArgumentNull(predicate, "predicate");

            this._predicate = predicate; 
        }
 
        ///  
        /// Gets an  that specifies the predicate used to determine which members of the target collection should be deleted.
        ///  
        /// 
        /// The predicate can include only the following elements:
        /// 
        /// Equality expression 
        /// Constant expression
        /// IsNull expression 
        /// Property expression 
        /// Reference expression to the target
        /// And expression 
        /// Or expression
        /// Not expression
        /// 
        ///  
        public DbExpression Predicate
        { 
            get 
            {
                return _predicate; 
            }
        }

        internal override DbCommandTreeKind CommandTreeKind 
        {
            get { return DbCommandTreeKind.Delete; } 
        } 

        internal override bool HasReader 
        {
            get
            {
                // a delete command never returns server-gen values, and 
                // therefore never returns a reader
                return false; 
            } 
        }
 
        internal override void DumpStructure(ExpressionDumper dumper)
        {
            base.DumpStructure(dumper);
 
            if (this.Predicate != null)
            { 
                dumper.Dump(this.Predicate, "Predicate"); 
            }
        } 

        internal override string PrintTree(ExpressionPrinter printer)
        {
            return printer.Print(this); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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